All bike tours meet & end at The Walrus Bar & Hostel.
172 Westminster Bridge Road, SE17RW.
The closest underground station is Lambeth North (on the Bakerloo Line). Turn right out of the station and walk up the road past the Horse & Stables pub, you'll see the Walrus a little further up. The Walrus Bar is a 1 minute walk from the station exit.
Feel free to use the bathroom & wifi facilities upon arrival.